Tzu-Ching LED hw

 

 

 

int led = 11;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 1;    // how many points to fade the LED by
const int buttonPin = 7;     // the number of the pushbutton pin
const int ledPin =  11;      // the number of the LED pin
 
// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status
 
 
// the setup routine runs once when you press reset:
void setup() {
  // declare pin 11 to be an output:
  pinMode(led, OUTPUT);
   // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);}
 
 
 
void loop() {
 
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
 
  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) { 
    //if the button is pressed,increased fade amount by 1
    fadeAmount = fadeAmount + 5;
  }
 
  // set the brightness of pin 11:
  analogWrite(led, brightness);
 
  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;
 
  // reverse the direction of the fading at the ends of the fade:
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
    
  }
  // wait for 30 milliseconds to see the dimming effect
  delay(30);
  
}